Re: MQC shape vs peak command confusion

Thanks everyone. If I want to achieve peak rate of 128kbps, I still have
many choices.

1) Keep CIR = 128kbps and Be = 0. This makes PIR = CIR = 128kbps
2) Keep CIR = 85kbps and Be = Bc / 2. This makes PIR = 128kbps
3) Keep CIR = 64kbps and Be = Bc. This makes PIR = 128kbps .. etc.

In the lab if the task doesn't say anything about Be, should I assume Be = 0
or Be = Bc ?

Regards,
Naveen.

On Sat, Apr 4, 2009 at 11:34 AM, Salah ElShekeil
<salah.elshekeil_at_gmail.com>wrote:

> be aware that the shape peak formula is not the same as the shaping formula
>
>
>
> shape peak
>
>
>
> peak rate = CIR(1 + Be / Bc)
>
>
>
> shape average (CIR) = bc*1000/tc
>
>
>
> HTH
>
>
>
> Salah
>
>
>
> On Sat, Apr 4, 2009 at 4:40 PM, Ruhann <groupstudy_at_ru.co.za> wrote:
>
>> Mr Petr wrote a great article about the shape peak command:
>>
>>
>> http://blog.internetworkexpert.com/2008/08/26/understanding-the-shape-peak-command/
>>
>> On Sat, Apr 4, 2009 at 6:27 AM, naveen M S <navin.ms_at_gmail.com> wrote:
>>
>> > Group,
>> >
>> > Here is my task :
>> >
>> > 1) Shape HTTP traffic to a peak rate of 128kbps sent out to Vlan 34.
>> > 2) Use Bc and Be bursts based on 10ms interval.
>> >
>> > *My solution was -*
>> >
>> > class-map HTTP
>> > match protocol http
>> > policy-map SHAPE
>> > class HTTP
>> > * shape peak 128000 1280 0*
>> > interface gig 0/0
>> > service-policy output SHAPE
>> >
>> > Rack1R1(config-pmap-c)#* do sh policy-map int gig0/0*
>> > Target/Average Byte Sustain Excess Interval
>> Increment
>> > Rate Limit bits/int bits/int (ms) (bytes)
>> > 128000/128000 160 1280 0 10 160
>> >
>> > *The workbook solution was -*
>> >
>> > class-map HTTP
>> > match protocol http
>> > policy-map SHAPE
>> > class HTTP
>> > * shape peak 64000 6400 6400*
>> > interface gig 0/0
>> > service-policy output SHAPE
>> >
>> > Rack1R1(config-pmap-c)# *do sh policy-map int gig0/0*
>> > Target/Average Byte Sustain Excess Interval
>> Increment
>> > Rate Limit bits/int bits/int (ms) (bytes)
>> > 128000/64000 1600 6400 6400 100 1600
>> >
>> > What difference it makes to the peak output rate when either of the 2
>> > statements are given ?
>> >
>> > 1) shape peak 128000 1280
>> > 2) shape peak 64000 6400 6400
>> >
>> > Thanks,
>> > Naveen.
>> >
>> >
>> > Blogs and organic groups at http://www.ccie.net
>> >
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>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>> --
>> <ruhann>
>>
>>
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Received on Sat Apr 04 2009 - 12:04:02 ART